Amazing DIY solution to wireless thethering is described here, with much discussion here.
Particularly interesting is that this is doing standard USB so it matters not what type of camera, software, computer etc you are using.
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Here’s another DIY wireless USB solution that is really well packaged.
http://www.homebrewusb.com/DIY/DIY%20%20Portable%20Wireless%20USB.html
Looks like the dongle is directly powered off 3AA batteries